Channel defining fuel nozzle of combustion system

Abstract

A combustion system is provided and includes an annular body defining a combustion zone and a fuel nozzle. The fuel nozzle includes a tubular element having a hollow interior and is disposable such that the hollow interior fluidly communicates with the combustion zone. The tubular element includes wall portions defining a channel disposable for fluid communication with at least one of the hollow interior and the combustion zone. The defined channel is pressurizable with coolant at a pressure exceeding that of the combustion zone.

1 . A combustion system, comprising:
 an annular body defining a combustion zone; and   a fuel nozzle comprising a tubular element having a hollow interior and being disposable such that the hollow interior fluidly communicates with the combustion zone,   the tubular element comprising wall portions defining a channel disposable for fluid communication with at least one of the hollow interior and the combustion zone,   the defined channel being pressurizable with coolant at a pressure exceeding that of the combustion zone.   
     
     
         2 . The combustion system according to  claim 1 , wherein the pressure of the coolant exceeds that of the hollow interior with the hollow interior being pressurized at a pressure exceeding that of the combustion zone. 
     
     
         3 . The combustion system according to  claim 1 , wherein the annular body has a longitudinal axis and the tubular element has a longitudinal axis oriented transversely with respect to the longitudinal axis of the annular body. 
     
     
         4 . The combustion system according to  claim 3 , wherein the defined channel comprises:
 a first portion oriented transversely with respect to the longitudinal axis of the tubular element; and   a second portion oriented along the longitudinal axis of the tubular element.   
     
     
         5 . The combustion system according to  claim 1 , wherein the defined channel is provided as a plurality of channels arrayed around the tubular element. 
     
     
         6 . The combustion system according to  claim 1 , wherein the annular body has a longitudinal axis and the tubular element has a longitudinal axis oriented along the longitudinal axis of the annular body. 
     
     
         7 . The combustion system according to  claim 6 , wherein the defined channel is oriented along the longitudinal axis of the tubular element. 
     
     
         8 . The combustion system according to  claim 1 , wherein the defined channel extends from an upstream portion of the tubular element and terminates at or proximate to a downstream end of the tubular element. 
     
     
         9 . The combustion system according to  claim 1 , wherein the defined channel is provided as a first channel and a second channel,
 the first channel extending from an upstream portion of the tubular element and terminating at a downstream end of the tubular element, and   the second channel extending from the upstream portion of the tubular element and terminating proximate to the downstream end of the tubular element.   
     
     
         10 . The combustion system according to  claim 1 , wherein the wall portions comprise a flash back incidence fuse. 
     
     
         11 . A combustion system, comprising:
 an annular body defining a main combustion zone and a downstream combustion zone downstream from the main combustion zone; and   a fuel nozzle comprising a tubular element having a hollow interior and being disposable such that the hollow interior fluidly communicates with the downstream combustion zone,   the tubular element comprising wall portions defining a channel disposable for fluid communication with the downstream combustion zone,   the defined channel being pressurizable with coolant at a pressure exceeding that of the downstream combustion zone.   
     
     
         12 . The combustion system according to  claim 11 , wherein the annular body has a longitudinal axis and the tubular element has a longitudinal axis oriented transversely with respect to the longitudinal axis of the annular body. 
     
     
         13 . The combustion system according to  claim 12 , wherein the defined channel comprises:
 a first portion oriented transversely with respect to the longitudinal axis of the tubular element; and   a second portion oriented along the longitudinal axis of the tubular element.   
     
     
         14 . The combustion system according to  claim 11 , wherein the defined channel is provided as a plurality of channels arrayed around the tubular element. 
     
     
         15 . A combustion system, comprising:
 an annular body defining a combustion zone; and   a fuel nozzle comprising a tubular element having a hollow interior and being disposable such that the hollow interior fluidly communicates with an upstream-most portion of the combustion zone,   the tubular element comprising wall portions defining a channel disposable for fluid communication with at least one of the hollow interior and the combustion zone,   the defined channel being pressurizable with coolant at a pressure exceeding that of the combustion zone and the hollow interior.   
     
     
         16 . The combustion system according to  claim 15 , wherein the annular body has a longitudinal axis and the tubular element has a longitudinal axis oriented along the longitudinal axis of the annular body. 
     
     
         17 . The combustion system according to  claim 16 , wherein the defined channel is oriented along the longitudinal axis of the tubular element. 
     
     
         18 . The combustion system according to  claim 15 , wherein the defined channel extends from an upstream portion of the tubular element and terminates at a downstream end of the tubular element. 
     
     
         19 . The combustion system according to  claim 15 , wherein the defined channel extends from an upstream portion of the tubular element and terminates proximate to a downstream end of the tubular element. 
     
     
         20 . The combustion system according to  claim 15 , wherein the defined channel is provided as a first channel and a second channel,
 the first channel extending from an upstream portion of the tubular element and terminating at a downstream end of the tubular element, and   the second channel extending from the upstream portion of the tubular element and terminating proximate to the downstream end of the tubular element.